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Re: [EnergyPlus_Support] AirLoopHVAC with variable flow Air to Air Heat Pump



Hmm, Interesting.  I'll look into it.  I have been able to vary the airflow of the airloop using a massflow setpoint manager.

On Thu, Jul 7, 2011 at 6:13 PM, Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
 

Dear Karen,

I?m not sure quite what you are trying to do, but you might consider applying a curve to the fan power which makes the lower speed approximately correct.

I think I did this successfully a while ago, but cannot remember the details or why E+ even has a curve for an On/Off fan.  I hope that is enough to get you moving!

 

 

Fan:OnOff

Name

SFan_BaseBallrmSys4

Availability Schedule Name (1=available, 0=not)

SchCpct_FanOpern

Fan Efficiency (incl. motor)

0.28

Pressure Rise

416

Maximum Flow Rate

Autosize

Motor Efficiency

0.7

Motor In Airstream Fraction

1

Air Inlet Node Name

NodeOut_HtgCoilAir_BaseBallrmSys4

Air Outlet Node Name

NodeOut_Air_BaseBallrmSys4

Fan Power Ratio Function of Speed Ratio Curve Name

Fan Efficiency Ratio Function of Speed Ratio Curve Name

End-Use Subcategory

 

 

The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Karen Walkerman
Sent: Thursday, July 07, 2011 5:42 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] AirLoopHVAC with variable flow Air to Air Heat Pump

 

 

Hi,

 

Does anyone know how to set up a supply-side AirLoopHVAC object with an air-to-air heat pump providing variable air flow?  The AirLoopHVAC:UnitaryHeatPump:AirToAir objects only allow on/off and constant volume fans.

 

I need to be able to step-back my fan airflow at night to a lower level.

 

Thanks,

 

--

Karen




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